Incorrect large-area clipping

Incorrect large-area clipping
https://bugs.webkit.org/show_bug.cgi?id=95197

Reviewed by Nikolas Zimmermann.

Source/WebCore:

ImageBuffers allocated for clipping and masking are clamped to kMaxImageBufferSize max
(4096x4096). In order to properly account for the scaling factor introduced by this
clamping, the repaintRect translation component needs to be pushed after the scaling
transform.

Tests: svg/custom/clamped-masking-clipping-expected.svg
       svg/custom/clamped-masking-clipping.svg

* rendering/svg/SVGRenderingContext.cpp:
(WebCore::SVGRenderingContext::createImageBuffer):

LayoutTests:

* svg/custom/clamped-masking-clipping-expected.svg: Added.
* svg/custom/clamped-masking-clipping.svg: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@126993 268f45cc-cd09-0410-ab3c-d52691b4dbfc